Improvement in saw-mill head-blocks



T. DILGER s w. n. DUNN.

Saw-Mill Head-Block.

Patented Sept'. 7, I875.

- INVENTORS 474011121 .9

WITNESSES 15 X1,

N.PEIERS, PHOTD-LITHOGRAFHER WASHINGTON. D C.

NITED STATES THEODORE DILGER AND WILLIAM R. DUNN, OF ALTON, INDIANA,ASSIGNORS TO THEMSELVES AND ABRAHAM N. PEOKINPAUGH.

IMPROVEMENT IN SAW-MILL HEAD-BLOCKS.

Specification forming part of Letters Patent No. 167,511, datedSeptember 7, 1875; application filed June 24, 1875.

To all whom it may concern:

Be it known that we, THEODORE DILGER and WILLIAM R. DUNN, of Alton,Indiana, have invented certain new and useful Improvements in Saw-MillHead-Blocks; and we do hereby declare the following to be a full, clear,and exact description thereof, reference being bad to the accompanyingdrawings making a part of this specification, in which Figure 1 is aplan view of the movable carriage of a saw-mill. Fig. 2 is a sectionthrough the line a: as, Fig. l.

Our invention relates to the construction and arrangement of theset-works of a sawmill; and it consists in the screw-register attachmentto facilitate the setting of the log.

In order that others skilled in the art may make and use our invention,we will proceed to describe the exact manner in which we have carried itout.

In the drawings, A represents the framework of a common movablecarriage, upon which are secured the head blocks B B. Through eachhead-block B passes longitudinally a screw-shaft, O, having suitablebearings at D D. Upon the rear end of each shaft 0 is a beveledgear-wheel, E, meshing into the beveled gear-wheels F F on the shaft G,which has suitable bearings in the arms 9 g, and provided with thecrank-wheel H, by which motion is imparted to the same. On one end ofthe shaft G is constructed a screwthread, h, constructed of suchproportions as to register with the screw-thread of the shafts O G. Onthe screw-thread his placed the nut K, provided with a longitudinal bar,m, sliding in the slot M in the casing N, which incloses thescrew-thread h. the bar on is secured the index R, sliding over thescaled plate S to indicate the position of the brackets or standards TT, and register with the index t on each of the head-blocks, thusfurnishing a ready means by which the man at the head-block candetermine the exact movements of the log on the frame.

We are aware that dials, with pointers and wheels connected by anendless belt, have been used to register and indicate the position ofstandards or brackets upon the headblocks; but this combination ofdevices has proven insufficient and troublesome, as the points have tobe frequently set, and the belt is liable to variations in tension,which rensders its action uncertain.

Having thus described our invention, what ,we claim as new, and desireto secure by Let- "ters Patent, is- In a registering device forhead-blocks for saw-mills the shaft G, provided with the screwthread itand slotted casing N, in combination with the nut K, provided with thelongitudinal bar m, and index R, and scale-plate S, all constructed tooperate substantially as and for the purpose set forth.

THEODORE DILGER. WILLIAM R. DUNN. Witnesses:

H. B. MAYLIN, J. M. ALLEY.

Transversely of

